Rotary tool chuck



June 11, 1940,

J. PIERIK 2,203,967

ROTARY TOOL CHUCK Filed Nov. 29, 1937 Jai' INVENTOR. 7g/Z .Held/, BY

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ATTORNEY Patented June 11, 1940 UNITED STATES PATENT OFFICE: i 2,203,967

ROTARY ToonoHUoK Jan l"ierikndianapolis, Ind.`

Application November 29, 1937, Serial No. 176,977

,p either natural or articial dentures may be readily and thoroughly cleansed by `non-professional rusers than by means now currently available.

The accompanying drawing illustrates an embodiment of my invention. l

Fig. 1 is an axial section, somewhat enlarged, `with an adjacent end of a flexible drive shaft; Fig, 2 an elevation, on a smaller scale of a *complete equipment for household use,`includ ing my `improved chuck, a ilexible drive shaft, and an electric motor;

Fig. 3 a section on line 3 3 of Fig. 1; and

Fig. 4 a section on line 4-4 of Fig. 1.

In the drawing l'indicates the main tubular body ensmalled and threaded at the ends II and I2. Threaded on II is a tubular shell I3 internally threaded at Ill to receive a threadl ed tting I5 at one end of the non-rotative shell of a common flexible drive shaft I6.

Threaded on i2 is a tubular shell I1, supplemented by a cap il', perforated at its outer end to permit the entry of the shank I8 of a tool I9 to be rotated. l

Journalled in the bore of body `I() is a shaft 2l) having, at one end within shell I1, an axial bore 2l to receive shank I8, the end portion being externally tapered at 22 and axially split at several circumferentially .spaced.lines, as indicated at 23. Just back of the tapered portion 22, shaft 29 is threaded at 24 toreceive the chuck compressor 25 which is internally tapered to t portion 22 and compress the bore 2| to clamp shank I8. Compressor 25 is provided externally with one or more axially `extended grooves 26 open at one end.

The wall of shell Il is axially slotted from end to end,` at 2, and the side walls of the slot are provided with key ways 28 inwhich is `splined a key 29 provided with a portion 39 adapted to enter any one of the grooves 26 so that compressorz may partake of any rotative movement of shell I'I relative to body I 0.

5 y Key 29 is the full length of shell l1 so that, when said shell is seated against body Ill and cap Il is in place, the key cannot be shifted and its portion 39 is free from compressor 25 r and the compressor is free to rotate with shaft 2U.

shaft 29 for rotation. in place by nut 40 and. check nut 4I.

s release the tool.

away, as indicated at I0', throughout the greater portion of the circumference `and axially sufficient to permit key 29 to interlock` with teeth further rotation of shell Il, in the proper direc- 1f() tion, will withdraw compressor 25 from the grip-- ping `fingers r22.

Shaft 20 is provided with a collar 35 which abuts the forward'end of body I0 and this col` lar is provided with pockets 36 facing body Il) u and adapted `to receive the spring pressed locking pin 3l mounted to slide axially in body Ill. The outer end of pin 3l is exposed for contact with `an internal shoulder 38 of body I0 so that, when said `shell is seated against body l0, 2O pin 31 will be moved back into body I0 to free Shaft 20 is held axially `The flexible drive shaft structure I5-I6 may be conveniently driven from a small electric mo- 25 tor mounted on a bath room wall.

Any one of a series of tools I9, such as brushes of various shapes and stiffness, massage cups, etc., such as are commonly used by dentists in their dental engines for lcleansing natural den- 30 l tures and massaging gums, may be interchangeably mounted in my chuck.

i To perform this operation, shell I'I is backed off frombody Il) enough to permit key 29 to be shifted into engagement with compressor 25 35 whereupon further backing off of the lshell I1 operates to turn compressor 25 on shaft 20 to Backing olf of shell I1 permits the locking pin 3Ito` enter a pocket 36 to prevent rotation of shaft 2U. 40

Another tool being inserted in bore 2|, shell Il is returned to abutment on body Il), the first portion of the movement turning compressor 25 on shaft 29 to clamp the shank of the tool, thereafter bringing the projected end of key 29 against 4,5 portion I0 to move they key out of engagement with the compressor, and bringing shoulder 38 against locking pin 31 and shifting said pin out of Docket 36 to release shaft 29 for rotation.

It `will be noted that, when shell I 'I is seated 50 against body Il), key 29 is heldl against displacement so that compressor 25 cannot be accidental- 1y released. Also that, when shell I'I is backed away from body I0 preparatory to engagement of 29 `with 25, the locking pin 3I-is automatically 55 released to lock shaft 20 during manipulation of the chuck compressor.

When all of the parts are in operative position body I and shells I3 and I1 form a unitary structure of convenient size and shape to [be held in the hand and no exposed part is rotative with shaft 2D. 'Y

While my improved chuck has been primarily designed as part of a non-professional dental equipment, it will be readily apparent that it Will be useful for other purposes and types of tools.

If automatic actuation of the key 29 is desired, a spring 50 is interposed between said key and cap I1 so that, when shell I1 is backed away from the main body, the spring will automatically project the key into one of the keyways of the compressor.

I claim as my invention:

l. A tool holder comprising, a main tubular body, a shaft journalled therein with a tool-receiving chuck at one end and a power-receiving portion at the other end, a compressor` threaded on the shafttc engage the chuck, a shell threaded on the main body and encompassing the chuck `and compressor, and a key carried by said shell and accessible from the exterior thereof and movable into and out of non-rotative interlock with the compressor, and a locking pin carried by the main body movable into and out of nonr'tative interlock with the shaft and engageable by the shell to be moved out of said interlook byaxial movement of the shell on the main body.

2. A tool holder comprising, a main tubular body, a shaft journalled therein with a tool-reby the shell to be moved outof said interlock by movement of the shell on the mainbody.

Zl. A tool holder comprising, a main tubular body, a shaft journalled therein with a tool-receiving chuck at one end and a power-receiving portion at the other end, a chuck-operating member threaded on theI main body, a locking pin carried by the main body movable into and out of non-rotative interlock with the shaft, and en- Agageable by the said chuck-operating member to be moved thereby out of its interlock with the shaft by movement of said member.

5. A tool .holder comprising, a main tubular body a shaft journalled therein with a tool-receiving chuck at one end and a powerreceiving portion at the other end, a member rotatably threaded on the main body, a locking' pin carried by the `main body movable into and out of non-rotative interlock with the shaft, and engageable by the said member to be moved upon rotation of said member out of its interlock with the shaft by movement of said member.

JAN PIERlK. 

